build(deps-dev): bump postcss-nested from 6.0.1 to 6.2.0

Bumps [postcss-nested](https://github.com/postcss/postcss-nested) from 6.0.1 to 6.2.0.
- [Release notes](https://github.com/postcss/postcss-nested/releases)
- [Changelog](https://github.com/postcss/postcss-nested/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss-nested@6.0.1...6.2.0)

---
updated-dependencies:
- dependency-name: postcss-nested
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>